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Acoustic galvanic isolator

a galvanic isolator and acoustic technology, applied in the direction of impedence networks, electrical equipment, etc., can solve the problems of inconvenient fabrication, inconvenient use, and inability to provide an absolute break in the conduction path of capacitors, etc., and achieve the effect of being inexpensive to manufactur

Inactive Publication Date: 2007-04-19
AGILENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] An electrically-isolating acoustic coupler is physically small and is inexpensive to fabricate yet is capable of acoustically coupli

Problems solved by technology

Inexpensive opto-isolators are typically limited to data rates of about 10 Mb / s by device capacitance, and from power limitations of the optical devices.
Such conflicting requirements are often difficult to reconcile.
Using capacitors does not provide an absolute break in the conduction path because the information signal is transmitted electrically throughout.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0056]FIG. 2 is a schematic diagram showing an example of an acoustic coupler 100 in accordance with the invention. Acoustic coupler 100 comprises a single decoupled stacked bulk acoustic resonator (DSBAR) 106, inputs 26, 28, outputs 32, 34, an electrical circuit 140 that connects DSBAR 106 to inputs 26, 28 and an electrical circuit 141 that connects DSBAR 106 to outputs 32, 34. DSBAR 106 incorporates an electrically-insulating acoustic decoupler 130 that provides electrical isolation between inputs 26, 28 and outputs 32, 34.

[0057] When used as electrically-isolating acoustic coupler 16 in acoustic galvanic isolator 10 shown in FIG. 1, acoustic coupler 100 acoustically couples modulated electrical signal SM from inputs 26, 28 to outputs 32, 34 while providing electrical isolation between inputs 26, 28 and outputs 32, 34. Thus, acoustic coupler 100 effectively galvanically isolates output terminals 36, 38 from input terminals 22, 24, and allows the output terminals to differ in volta...

second embodiment

[0081]FIG. 5B is an enlarged view of the portion marked 5A in FIG. 4B showing electrically-insulating acoustic decoupler 130. In the embodiment shown in FIG. 5B, acoustic decoupler 130 is composed of an electrically-insulating acoustic Bragg structure 161. Electrically-insulating acoustic Bragg structure 161 comprises a low acoustic impedance Bragg element 163 located between high acoustic impedance Bragg elements 165 and 167. At least one of the Bragg elements 163, 165 and 167 of Bragg structure 161 comprises a layer of material having a high electrical resistivity, a low dielectric permittivity and a high breakdown field. Low acoustic impedance Bragg element 163 is a quarter-wave layer of a low acoustic impedance material whereas high acoustic impedance Bragg elements 165 and 167 are each a quarter-wave layer of high acoustic impedance material. The acoustic impedances of the materials of the Bragg elements are characterized as “low” and “high” with respect to one another and with...

third embodiment

[0104]FIG. 8 is a schematic diagram showing an example of an acoustic coupler 300 in accordance with the invention. FIG. 9A is a plan view showing a practical example of acoustic coupler 300. FIGS. 9B and 9C are cross-sectional views along section lines 9B-9B and 9C-9C, respectively, shown in FIG. 9A. The same reference numerals are used to denote the elements of acoustic coupler 300 in FIG. 8 and in FIGS. 9A-9C.

[0105] Acoustic coupler 300 comprises inputs 26, 28, outputs 32, 34, and an insulated stacked bulk acoustic resonator (IDSBAR) 306 in accordance with a second IDSBAR embodiment. In its simplest form, an IDSBAR in accordance with the second IDSBAR embodiment has a first half-wave acoustically-resonant electrical insulator, an acoustic decoupler and a second half-wave acoustically-resonant electrical insulator located in order between its constituent FBARs. IDSBAR 306 in accordance with the second IDSBAR embodiment gives acoustic coupler 300 a substantially greater breakdown v...

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Abstract

Embodiments of the acoustic galvanic isolator comprise a carrier signal source, a modulator connected to receive an information signal and the carrier signal, a demodulator, and an electrically-isolating acoustic coupler connected between the modulator and the demodulator. In an exemplary embodiment, the electrically-isolating acoustic coupler comprises film bulk acoustic resonators (FBARs). An electrically-isolating acoustic coupler is physically small and is inexpensive to fabricate yet is capable of passing information signals having data rates in excess of 100 Mbit / s and has a substantial breakdown voltage between its inputs and its outputs.

Description

RELATED APPLICATIONS [0001] This disclosure is related to the following simultaneously-filed disclosures: Acoustic Galvanic Isolator Incorporating Single Decoupled Stacked Bulk Acoustic Resonator of John D. Larson III (Agilent Docket No. 10051180-1); Acoustic Galvanic Isolator Incorporating Single Insulated Decoupled Stacked Bulk Acoustic Resonator With Acoustically-Resonant Electrical Insulator of John D. Larson III (Agilent Docket No. 10051205-1); Acoustic Galvanic Isolator Incorporating Film Acoustically-Coupled Transformer of John D. Larson III et al. (Agilent Docket No. 10051206-1); and Acoustic Galvanic Isolator Incorporating Series-Connected Decoupled Stacked Bulk Acoustic Resonators of John D. Larson III et al. (Agilent Docket No. 10051207-1), all of which are assigned to the assignee of this disclosure and are incorporated by reference. BACKGROUND [0002] A galvanic isolator allows an information signal to pass from its input to its output but has no electrical conduction pa...

Claims

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Application Information

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IPC IPC(8): H03H9/54
CPCH03H9/587H03H9/605H03H9/132H03H9/584
Inventor LARSON, JOHN D. IIIHARDCASTLE, IAN
Owner AGILENT TECH INC
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